Looks like Celestia 1.5.0 was released the other day. This is one of my all-time favorite free apps; an absolutely stunning desktop planetarium that allows you to zip around the solar system (and beyond). Available for Windows, Mac, and Linux.
What’s more, the Celestia Motherlode hosts over 10 GB of add-ons uploaded by various creators, ranging from detailed planetary texture maps to dozens of spacecraft, Voyagar to Enterprise (though I have yet to see V’ger).
Definitely worth a look if you’re a space buff. There’s a new release every year or so which always prompts me to loose at least a couple of hours jumping back and forth between planets. Wasted time nevertheless soulfully well invested.